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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6232a9fc1ad8de50461d4f42991aab541bb9fad702ba80d29a6e58acd64bca4e' 
  AND token = 'JySqRxADFgIU1/Wlim6y0mXl6ahRJGT3PKpAUNRArhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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