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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0203c46a5044bb6b3d2362339bbbefbcb8d1a6308b6029921cdb358b2b463a09' 
  AND token = 'glqA9AL6npO3R7fVW1Vobw/GKn/58b9TapGcBUHW0iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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