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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d6bf9d2cf416c512f008006a1576b6c14e7484a6a6b1fd70256382e34fd966' 
  AND token = 'Ea/3i8Q579ot1uGOJ9yxPMkfVaSp1/ArXn7eO1CdXN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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