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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c73081927669e10c4ec5b5dd3d063c84c024f70d2d30dbca3c8753592504a0' 
  AND token = 'r1VnPGR7lBfidrzaR0no5Gnc+HnDUuIqq7T6yGp8bTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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