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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69163d240409c735f235fa72030d0eaefd0e0cf80507cb0b20f800619b33efa' 
  AND token = 'JV7PyJrxW5XjZ0lcSc8lU2TjeIHs6v2EC/V3tzMdyHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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