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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aa4f4c4b58de0624aa551425683b6846f5e2212792e920d9a0a66133424b2f' 
  AND token = '2OCCidIc4NrfWT+axESJ9sq662tVKMww5MT9EOD3hOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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