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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065b9a5c2e98a329b7145486e6b8c4fb24f12dc094ff7d0db03fb948ae5243f5' 
  AND token = 'Kp8zEDj0iedSDlK6d6MDrtSS1Gn/RsWzIFBrLT619Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}