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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6f863ffbde1e2ed3a9a5b6a4d007f7386d76e5671a65a28f223920cabfefbd' 
  AND token = 'McVqBznjl6RYOUK6cuXaaQ7Npp+W8ASXoA0L229/nl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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