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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a995e676958b47794c86c23da2585414cc1585b37ed3f077d9fd1efa0953ce' 
  AND token = 'C8hmMHCRRLlJyo4MxafdRjqvvoPSrB4kgIWmO6IEdMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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