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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12c79ebe97f2bdc61122868a397fc024ea67912d6115400683675835289ad8c' 
  AND token = 'EB7cROncA/eZQRP2LJT9KjhOXMf/gQw8jnztx2O0eEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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