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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec99c4b84d476a707991e28276a3229378f2a0000314d297ff4edb7055ddae7a' 
  AND token = 'Nz5oNPzAKy3B1nFhZ+i66dkhi7PWJArrDhd/j06XEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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