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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af5a5cbca0e06297cdfe7ab8c68a0bfe7e8a43ab00d71045a0449f8bb7f24d6' 
  AND token = 'f5Gm0b6UqdmFs224FLLkf5cKcND7emnCjJls8Ms2Fcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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