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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9686f5329881e95e2137c4b7f0e0aca701099c3c8bbdbbe2362a4341bd036db4' 
  AND token = 'FmEQpunPC5DFA+yenJ1DbVXWP9t/wexatmWkrvv5Mho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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