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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db0622921ce1a6f483f0d4e4036eb5f4233439fc295349f89c0fe40fd97934a' 
  AND token = 'cazU/4QbsqF7wyCYehD6mksw6QBhKnC5VPXfWZDarss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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