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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79863aa5390f49e0d12a5f5e70ec39ea8f8f5e7a82c5621df065586b930463ac' 
  AND token = 'XgTYyD+AQuWRmlRmvq31hX0aP+cgw9v+Fgs3arBUzfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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