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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c55f8a2d649b413e1d1a9f6fd6a04c11570840dae45c486aeb9ddc97e0834b' 
  AND token = 'OLdwPD3t38+WHYKkpli/u6eUfCfofTsUkR7tN4G34uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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