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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd028c9d6c323d04996436cfa433b6f32b0de03e122cd866d7a0621188e296b99' 
  AND token = 'XFcNIlRC2j1DCn8KtUoa1unI0btIgETmmaKjYkt74rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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