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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a035695f6d4fee0a33297c7ec32bd57fe5f99a5ce0d4711960a8ba5aa1d97ff' 
  AND token = 'qz9D64mvIwtGx87+LMgmpU1rb6Dx6i7XYsGGIinqDFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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