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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f342cfcc9fcf41239657ad83ee8ee33fcc97f773ba0005a79ceced6fca1bdf08' 
  AND token = 'euN0w/2NNsT5Ru0AapOuB3TndTKjCvhRgDvzaJtxl0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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