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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8b0e0e6daffc176046582303c1b33930bed79d04654eed46068709c703e328' 
  AND token = '00h9fjLaqrzCA7BGpJmJ/iByDaS+oN06heZSuI1j3Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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