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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cd61c2c2a882f8228ee5810b350e31df1bb1d12b207c18ef7c446bd7f5e997' 
  AND token = '5//pzOtHHZO4PUtvHbTv1KvwiR8FB623u0agAQ+XkcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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