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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9179c5ef123619217cb8a2914ee5dc2ff5d6f9844f534adf72322aeb4e344bf' 
  AND token = '+lsQzMsEBBttxkw1R5AXHUY+oXY2Mmk3nuFdrcIuw1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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