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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda0634a3c3212e6b835ac98c7a06d5c745e2f96a1c1733f35518c440c520965' 
  AND token = 'xF5cEP/XdkUOIyV8yz8+gn1oO5kmSO23LBbi37BY0zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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