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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb08751917105bd0679a14207e73b543dbcebc0cdd0d11d30ba1c7034a5a1831' 
  AND token = 'g/v8a7HGX89Q/5ZPwmHInDFnX1LhijL5fkNB/DkhwTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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