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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238f2643805de79ac464b60b6e9a4afa97e92cbf910bfea809406bc26867a68a' 
  AND token = 'hFn+luVTebWhYSF/3o3Y8DEWZyOMz0Es507o9mCJdS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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