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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c16c71eb6bca5aa00dc0159b695a2d82e1de36778d5d6e7b3731718342fa171' 
  AND token = 'RT5YDUa9o5Tqa7K/w4bZAOKZ9WVK/jPNtMyXdKvgKeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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