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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cd95455ac92988fbeaf45bd194654cd6cb7d7906c578ede8e5b92fdec3545b' 
  AND token = 'LD2J4aV2peC5FKYMHTMsqHGLatQGu4w8QlrurbPm974=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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