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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe32eb8fd38003c5d301fff067b72fc33c32dc86569f32fac0bd52d09f7753b5' 
  AND token = 'LTZMoQvmJpou6DBvlvnY7SJG9KccjaPKdT97Co+/JOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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