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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0003ea5aeba6b04d2ac883362c1bbcdaf1c43d9ca336177d763fe4010c20cc5e' 
  AND token = 'Vy3Y18ryYtTdd9GDX0WVuDLU+w8cIx5WDvLQxHF7mzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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