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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb36b34ce8aef31da2e1d55865eaceb9ae7226211765c99118711cc78d3c3dc' 
  AND token = 'mD6wOG6t3l/WjGtXHRZNWdTjjg3k4RaWVjFc3vWfA9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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