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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdad63261aecc7b85657793a9992e69d0f8f646abc7f32e3ce5d6ec50e68ad57' 
  AND token = '/oJAQdVdxAH5wV8dihdfADqdN4yHEqFwH1+PSOvBuGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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