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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328ccb3ea02d7c29a0f0a3b24c67ce453efe13126c878b556b0a2cd5b0f42cf6' 
  AND token = '4lRho/z/3SzNK1uMDIMU4F/OtmI6MO7/X17v5sRq8Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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