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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b903e4c4dbc799aeab68c1a98365ad912778885f6b28fd2d369acda544e70e50' 
  AND token = 'lA5FUPf5X++L2OBrV/+avboA0QquuLSmpcVMGtR3MMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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