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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b661cbd3792b1dffefbfd884d65e628d193f56927d5c137e6167a82ce6be5388' 
  AND token = '9jW8G6WXGD1gfPo7PqFFH2nVv1aNLgfEcLLYU7xawDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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