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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569cea772b26f95afbf8933d4944c764bdec6725bbf606525e1548a37a69a11a' 
  AND token = 'PYNZSO+ems3ak1NV5cdo7V6kqkoabKAFB6ZII8m1qhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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