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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4efa0460fa47306b29c0f4004d3146892f4f90a6d2aa770a94d9d91928ac534' 
  AND token = 'ACIdk5mFOJ2YeZ8RaiAh1NvDYvDxOSTzdq0UrEi112Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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