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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d838801057ebf564be90b2d19ccef9e5f5b3fedb6879fdffbc4838d19dd361b' 
  AND token = '3s7c4gosZwYUUJg6SZl3j6EhJoBDtVTc5gnoimDkyQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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