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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d8fa09e6aae8a69fc6b527bd34526711f9486ab4788b1ea36af97835e07961' 
  AND token = 'gcoPuFyg1QukbuN5LGntav5Uq9ZHekQihI8Qyp6ZFDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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