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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69171c3148d1f0c5fca0702ee96e76314aa7397820619463ef9ffb5a1012913f' 
  AND token = 'DgKUKUTMHDWQ9XT9sLX+P675naUDfID8tsziDodz0gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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