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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6b6e2c0fac4108b2806e804e2d03e32b91093c871c1fd8bc86d2fd1401f523' 
  AND token = 'ZiWMRLaQb2xOdN9m/SO9UuN8GTPte1a+lmh50GtO85c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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