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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11aa099b9fdc064125c8b2ac4c195d0c32a0705c9e8e186e9fa46a43427d9747' 
  AND token = 'TRCtug4WUAwEKYFkxsBKbNTTxIaD6DB1FTdX14ZnbSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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