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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afd433506ebe664a11ca9c411a9b220586ca6b6f73d5f1e31b56c442aa58475' 
  AND token = 'zfXcDVd/fA6Za7o5QpN7jG5pPONcdyjoJn89QV6s3bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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