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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d1a966e5341e764efed408e7761e281395c3c19f45572266a7e62e989c0bd3' 
  AND token = '5ynshJFknoB2jDpEHIZX9el7CY0txFQX9WyYH3OCCrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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