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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44df3fdb8983d54c8ae8e31c70b95087bae376216f1ce3f38514a1930434330e' 
  AND token = 'ul+RzMudmvw4C3AWcjU27RJT9pp4GPvdrrcAY34jzaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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