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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e809347126f593d40964979290d248136b578a570c8e7adc6304aace2162f8' 
  AND token = '42JY5qY+dI4z8UxC+SI2kTeDO1JnvyJIppJRFBJpRYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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