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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10040b61c7ea160e9a772d6eac0f47132c815f30072811ddc32ca2f2796e09e6' 
  AND token = 'P0+70388ucaiua0kp9L7qF3NQZrG9PNhN5rpT0rxf+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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