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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53aae04ef67a1e90513726bc68bf303722c47455fb4d897a6b9b7442b2a5adea' 
  AND token = '837F4cIV7PJ9U3oZ9fXk97jRO68vXWDyqT9fGkoyTAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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