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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b34f90444796891dc62e80a9fb59446a52ab76beafff56d950facfea91741c' 
  AND token = 'd4Agp72cUr8DatRpqiXQlCY5e8f21InIKR8zfXH0ZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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