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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d48e2ea87d6dac24ff53fa9713b77eac1e21948b8154ce4844da4f7aa6bf2c4' 
  AND token = '7RXLzTH5YVCsIQLlcQyU2Vdbl8aiKuv35KFaZGFgav8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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