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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f88ed6cfe0bd70fd215dd9d67fd584f014eba88be75be1a474fc0d462313abb' 
  AND token = 'OJRF7Ng2BReE887deFiTGb1b59t6hA+Sz6dOGBpodgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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