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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64aae13650f2c322424c668c3757b3cfd813745adaa96e286dfb88c1fd2d50af' 
  AND token = 'Nev80ks5XUm2FU5aOv2qA2kkcpp/SC/Z9lvg97QdR2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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