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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b2ccce4076b513bbda4a8122831071679e08277c77445b10eeccd6eac93bc8' 
  AND token = 'oRxIrGEzSh2k4n8k4uuwDVjbfWW6bVpdf61HsSWK9+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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