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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944d6a0361c4b87b1c107e61da5fed8df11de175f6be7b23c426f435426a3009' 
  AND token = 'c7sFUO5RjIHYjAx68iDPeuEcR6jCXma81h3vjtydTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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